I went to the Orchid festival last year. They were packing up one of the big greenhouses for restoration. A woman was querying why the Rhododendron fragrantissimum had parcels of moss in plastic tied on the stems. The gardener working nearby was studiously ignoring her. I explained to the lady that it was being air layered, so that if it died when they moved it, they would have a spare to replace it.
About a month later, they showed just that on the TV. My OH commented that somewhere was a lady who was going...Oh I know that.